Add mDesiredServingState field in BaseServingState
As the suggestion from:
https://android-review.git.corp.google.com/c/platform/packages/modules/Connectivity/+/2489359/9/Tethering/src/android/net/ip/IpServer.java#b1176
Make BaseServingState an abstract class to prevent it from being used
directly. Additionally, move the handleNewPrefixRequest method into
BaseServingState because it is the only class that uses it.
To avoid TetheredState and LocalHotspotState from having to implement
their own enter function, add the mDesiredInterfaceState field to
BaseServingState.
Bug: 233175023
Test: atest TetheringTests
Change-Id: I03269c37e666345efb0c61039a2bb213f223a5a2
diff --git a/Tethering/src/android/net/ip/IpServer.java b/Tethering/src/android/net/ip/IpServer.java
index 65ea8e5..9d0f6b4 100644
--- a/Tethering/src/android/net/ip/IpServer.java
+++ b/Tethering/src/android/net/ip/IpServer.java
@@ -998,67 +998,6 @@
}
}
- private void handleNewPrefixRequest(@NonNull final IpPrefix currentPrefix) {
- if (!currentPrefix.contains(mIpv4Address.getAddress())
- || currentPrefix.getPrefixLength() != mIpv4Address.getPrefixLength()) {
- Log.e(TAG, "Invalid prefix: " + currentPrefix);
- return;
- }
-
- final LinkAddress deprecatedLinkAddress = mIpv4Address;
- mIpv4Address = requestIpv4Address(false);
- if (mIpv4Address == null) {
- mLog.e("Fail to request a new downstream prefix");
- return;
- }
- final Inet4Address srvAddr = (Inet4Address) mIpv4Address.getAddress();
-
- // Add new IPv4 address on the interface.
- if (!mInterfaceCtrl.addAddress(srvAddr, currentPrefix.getPrefixLength())) {
- mLog.e("Failed to add new IP " + srvAddr);
- return;
- }
-
- // Remove deprecated routes from local network.
- removeRoutesFromLocalNetwork(
- Collections.singletonList(getDirectConnectedRoute(deprecatedLinkAddress)));
- mLinkProperties.removeLinkAddress(deprecatedLinkAddress);
-
- // Add new routes to local network.
- addRoutesToLocalNetwork(
- Collections.singletonList(getDirectConnectedRoute(mIpv4Address)));
- mLinkProperties.addLinkAddress(mIpv4Address);
-
- // Update local DNS caching server with new IPv4 address, otherwise, dnsmasq doesn't
- // listen on the interface configured with new IPv4 address, that results DNS validation
- // failure of downstream client even if appropriate routes have been configured.
- try {
- mNetd.tetherApplyDnsInterfaces();
- } catch (ServiceSpecificException | RemoteException e) {
- mLog.e("Failed to update local DNS caching server");
- return;
- }
- sendLinkProperties();
-
- // Notify DHCP server that new prefix/route has been applied on IpServer.
- final Inet4Address clientAddr = mStaticIpv4ClientAddr == null ? null :
- (Inet4Address) mStaticIpv4ClientAddr.getAddress();
- final DhcpServingParamsParcel params = makeServingParams(srvAddr /* defaultRouter */,
- srvAddr /* dnsServer */, mIpv4Address /* serverLinkAddress */, clientAddr);
- try {
- mDhcpServer.updateParams(params, new OnHandlerStatusCallback() {
- @Override
- public void callback(int statusCode) {
- if (statusCode != STATUS_SUCCESS) {
- mLog.e("Error updating DHCP serving params: " + statusCode);
- }
- }
- });
- } catch (RemoteException e) {
- mLog.e("Error updating DHCP serving params", e);
- }
- }
-
private byte getHopLimit(String upstreamIface, int adjustTTL) {
try {
int upstreamHopLimit = Integer.parseUnsignedInt(
@@ -1173,11 +1112,28 @@
mBpfCoordinator.stopMonitoring(this);
}
- class BaseServingState extends State {
+ abstract class BaseServingState extends State {
+ private final int mDesiredInterfaceState;
+
+ BaseServingState(int interfaceState) {
+ mDesiredInterfaceState = interfaceState;
+ }
+
@Override
public void enter() {
startConntrackMonitoring();
+ startServingInterface();
+
+ if (mLastError != TETHER_ERROR_NO_ERROR) {
+ transitionTo(mInitialState);
+ }
+
+ if (DBG) Log.d(TAG, getStateString(mDesiredInterfaceState) + " serve " + mIfaceName);
+ sendInterfaceState(mDesiredInterfaceState);
+ }
+
+ private void startServingInterface() {
if (!startIPv4()) {
mLastError = TETHER_ERROR_IFACE_CFG_ERROR;
return;
@@ -1257,6 +1213,67 @@
}
return true;
}
+
+ private void handleNewPrefixRequest(@NonNull final IpPrefix currentPrefix) {
+ if (!currentPrefix.contains(mIpv4Address.getAddress())
+ || currentPrefix.getPrefixLength() != mIpv4Address.getPrefixLength()) {
+ Log.e(TAG, "Invalid prefix: " + currentPrefix);
+ return;
+ }
+
+ final LinkAddress deprecatedLinkAddress = mIpv4Address;
+ mIpv4Address = requestIpv4Address(false);
+ if (mIpv4Address == null) {
+ mLog.e("Fail to request a new downstream prefix");
+ return;
+ }
+ final Inet4Address srvAddr = (Inet4Address) mIpv4Address.getAddress();
+
+ // Add new IPv4 address on the interface.
+ if (!mInterfaceCtrl.addAddress(srvAddr, currentPrefix.getPrefixLength())) {
+ mLog.e("Failed to add new IP " + srvAddr);
+ return;
+ }
+
+ // Remove deprecated routes from local network.
+ removeRoutesFromLocalNetwork(
+ Collections.singletonList(getDirectConnectedRoute(deprecatedLinkAddress)));
+ mLinkProperties.removeLinkAddress(deprecatedLinkAddress);
+
+ // Add new routes to local network.
+ addRoutesToLocalNetwork(
+ Collections.singletonList(getDirectConnectedRoute(mIpv4Address)));
+ mLinkProperties.addLinkAddress(mIpv4Address);
+
+ // Update local DNS caching server with new IPv4 address, otherwise, dnsmasq doesn't
+ // listen on the interface configured with new IPv4 address, that results DNS validation
+ // failure of downstream client even if appropriate routes have been configured.
+ try {
+ mNetd.tetherApplyDnsInterfaces();
+ } catch (ServiceSpecificException | RemoteException e) {
+ mLog.e("Failed to update local DNS caching server");
+ return;
+ }
+ sendLinkProperties();
+
+ // Notify DHCP server that new prefix/route has been applied on IpServer.
+ final Inet4Address clientAddr = mStaticIpv4ClientAddr == null ? null :
+ (Inet4Address) mStaticIpv4ClientAddr.getAddress();
+ final DhcpServingParamsParcel params = makeServingParams(srvAddr /* defaultRouter */,
+ srvAddr /* dnsServer */, mIpv4Address /* serverLinkAddress */, clientAddr);
+ try {
+ mDhcpServer.updateParams(params, new OnHandlerStatusCallback() {
+ @Override
+ public void callback(int statusCode) {
+ if (statusCode != STATUS_SUCCESS) {
+ mLog.e("Error updating DHCP serving params: " + statusCode);
+ }
+ }
+ });
+ } catch (RemoteException e) {
+ mLog.e("Error updating DHCP serving params", e);
+ }
+ }
}
// Handling errors in BaseServingState.enter() by transitioning is
@@ -1265,15 +1282,8 @@
// and forwarding and NAT rules should be handled by a coordinating
// functional element outside of IpServer.
class LocalHotspotState extends BaseServingState {
- @Override
- public void enter() {
- super.enter();
- if (mLastError != TETHER_ERROR_NO_ERROR) {
- transitionTo(mInitialState);
- }
-
- if (DBG) Log.d(TAG, "Local hotspot " + mIfaceName);
- sendInterfaceState(STATE_LOCAL_ONLY);
+ LocalHotspotState() {
+ super(STATE_LOCAL_ONLY);
}
@Override
@@ -1301,15 +1311,8 @@
// and forwarding and NAT rules should be handled by a coordinating
// functional element outside of IpServer.
class TetheredState extends BaseServingState {
- @Override
- public void enter() {
- super.enter();
- if (mLastError != TETHER_ERROR_NO_ERROR) {
- transitionTo(mInitialState);
- }
-
- if (DBG) Log.d(TAG, "Tethered " + mIfaceName);
- sendInterfaceState(STATE_TETHERED);
+ TetheredState() {
+ super(STATE_TETHERED);
}
@Override